Question

A solution is prepared by adding 30g urea in 90g water. Calculate the mole fraction of both components

Answer 1

Explanation:

The molar mass of urea is ~60 g/mol and the molar mass of water is ~18 g/mol.

This means you have 0.5 moles of urea and 10 moles of water in your solution.

The mole fraction of urea then is: 0.5 / (10 + 0.5) = 1 / 21

The mole fraction of water is: 10 / 10.5 = 20 / 21